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Online since: February 2021
Authors: Mohamed Bououdina, Assia Azizi, D. Houanoh, R. Tala-Ighil, F. Bensouici, K. Chebout, S. Lamrani, Mahdia Toubane
All films crystallize into a Zincite-type structure.
Structure analysis The XRD patterns of the ZnO thin films (Fig. 2), as can be seen from (Fig. 2a), all detectable peaks can be ascribed to the ZnO Zincite-type structure (JCPDS card No. 01-073-8765).
Shanthi, Photocatalytic degradation of an organic pollutant by zinc oxide–solar process, Arabian Journal of Chemistry, 9 (2016) S1858-S1868
Wong, Effect of native defects on photocatalytic properties of ZnO, The Journal of Physical Chemistry C, 115 (2011) 11095-11101
West, Basic solid state chemistry, John Wiley & Sons Inc, 1999
Structure analysis The XRD patterns of the ZnO thin films (Fig. 2), as can be seen from (Fig. 2a), all detectable peaks can be ascribed to the ZnO Zincite-type structure (JCPDS card No. 01-073-8765).
Shanthi, Photocatalytic degradation of an organic pollutant by zinc oxide–solar process, Arabian Journal of Chemistry, 9 (2016) S1858-S1868
Wong, Effect of native defects on photocatalytic properties of ZnO, The Journal of Physical Chemistry C, 115 (2011) 11095-11101
West, Basic solid state chemistry, John Wiley & Sons Inc, 1999
Online since: September 2008
Authors: Wolfgang J. Choyke, Leif I. Johansson, Charíya Virojanadara, Ulrich Starke, M. Hetzel
Atomic and Electronic Structure of the (2×1) and c(2×2) 4H-SiC(1 102)
Surfaces
C.
Starke1) 1) Max- Planck-Institut für Festkörperforschung, Heisenbergstr. 1, D-70569 Stuttgart, Germany: chariya@fkf.mpg.de 2) Department of Physics, Chemistry and Biology, Linköping University, S-58183, Linköping, Sweden 3) Department of Physics and Astronomy, University of Pittsburgh, Pittsburgh, PA 15260, USA Keywords: atomic structure, electronic structure, 4H-SiC(1 1 02), photoemission, STM, LEED, one dimension.
The atomic and electronic structure of 4H-SiC(1 1 02) surfaces were investigated using scanning tunneling microscopy (STM), low-energy electron diffraction (LEED) and photoemission (PES).
It should be emphasized that the model proposed here should be only viewed as a plausible starting point for a quantitative structure determination by crystallography or total energy calculations.
The electronic structure of this SiC(1 1 02)-c(2×2) phase is experimentally determined by angle resolved PES studies of the valence band revealing four surface states.
Starke1) 1) Max- Planck-Institut für Festkörperforschung, Heisenbergstr. 1, D-70569 Stuttgart, Germany: chariya@fkf.mpg.de 2) Department of Physics, Chemistry and Biology, Linköping University, S-58183, Linköping, Sweden 3) Department of Physics and Astronomy, University of Pittsburgh, Pittsburgh, PA 15260, USA Keywords: atomic structure, electronic structure, 4H-SiC(1 1 02), photoemission, STM, LEED, one dimension.
The atomic and electronic structure of 4H-SiC(1 1 02) surfaces were investigated using scanning tunneling microscopy (STM), low-energy electron diffraction (LEED) and photoemission (PES).
It should be emphasized that the model proposed here should be only viewed as a plausible starting point for a quantitative structure determination by crystallography or total energy calculations.
The electronic structure of this SiC(1 1 02)-c(2×2) phase is experimentally determined by angle resolved PES studies of the valence band revealing four surface states.
Online since: April 2007
Authors: Georg Grathwohl, Dietmar Koch, Christian Soltmann
Since these structures can suffer during operation due to their weakness a new type of porous ceramic
composites was developed where the biological phase is immobilized in a rigid inorganic matrix of
high permeability for fluids.
The pore structure induced by ice crystal formation during freezing may be adjusted for optimal penetration of the nutrient medium in order to feed the microorganisms.
It is likewise a process following the principles of soft chemistry where the living cells are frozen but not mechanically or chemically stressed.
Chemistry Vol. 11 (2001), pp. 2039
Chemistry Vol. 13 (2003), pp. 203
The pore structure induced by ice crystal formation during freezing may be adjusted for optimal penetration of the nutrient medium in order to feed the microorganisms.
It is likewise a process following the principles of soft chemistry where the living cells are frozen but not mechanically or chemically stressed.
Chemistry Vol. 11 (2001), pp. 2039
Chemistry Vol. 13 (2003), pp. 203
Online since: October 2024
Authors: Pannarot Kitpimonkul, Amornrat Khampuanbut, Prasit Pattananuwat
PVIPS offers a well-defined pathway for ion transportation caused by cationic and anionic groups in structure.
In addition, PVIPS also shows a well-defined pathway interaction of Zn2+ and (OTf)2- ion transportation along with cationic and anionic groups in structure.
Fig. 4(b) shows a pair of redox peaks at 1.3 and 1.42 V evidently confirms the typical process of Zn2+ intercalation/deintercalation reaction into MnO2 structure.
Liu et al: submitted to Royal Society of Chemistry (2024) [7] H.
Quan et al: submitted to Frontiers in Chemistry (2020) [10] K.
In addition, PVIPS also shows a well-defined pathway interaction of Zn2+ and (OTf)2- ion transportation along with cationic and anionic groups in structure.
Fig. 4(b) shows a pair of redox peaks at 1.3 and 1.42 V evidently confirms the typical process of Zn2+ intercalation/deintercalation reaction into MnO2 structure.
Liu et al: submitted to Royal Society of Chemistry (2024) [7] H.
Quan et al: submitted to Frontiers in Chemistry (2020) [10] K.
Online since: November 2014
Authors: Yan Wang, Zhe Sheng Feng, Jin Ju Chen, Zhen Yu He, Lu Lin Wang
Introduction
Since Goodenough et al.[1] reported that the olivine structure LiFePO4 is good cathode material for Lithium-ion battery, much research has been made to explore this promising material.
The structure and electrochemical properties of Li0.97K0.03FePO4 and Li0.97K0.03FePO4/graphene composites were investigated.
The K ion tends to replace Li site because KFePO4 and LiFePO4 have the similar structure[16].
Liu, Graphene modified LiFePO4 cathode materials for high power lithium ion batteries, Journal of Materials Chemistry. 21 (2011) 3353-3358
Wexler, Journal of Materials Chemistry. 22 (2012) 16465-16470
The structure and electrochemical properties of Li0.97K0.03FePO4 and Li0.97K0.03FePO4/graphene composites were investigated.
The K ion tends to replace Li site because KFePO4 and LiFePO4 have the similar structure[16].
Liu, Graphene modified LiFePO4 cathode materials for high power lithium ion batteries, Journal of Materials Chemistry. 21 (2011) 3353-3358
Wexler, Journal of Materials Chemistry. 22 (2012) 16465-16470
Online since: August 2011
Authors: Hong Mei Niu
Conducting Polymer Functionalized Single-walled Carbon Nanotubes: Synthesis, Morphological Characteristics and Thermal Stability
Hong-mei Niu
College of Chemistry & Chemical Engineering, Xi’an University of Science & Technology, Xi’an 710054, China
niu-03@163.com
Keywords: polypyrrole; single walled carbon nanotubes; in situ polymerization; thermal stability
Abstract.
The morphological structure, electrical conductivity and thermal stability of the nanocomposites were characterized by TEM, SEM, FTIR and TGA.
The SWNTs used in this work were purchased from Chengdu Institute of Organic Chemistry, Chinese Academy of Sciences. pyrrole monomer (Py), FeCl3·6H2O were used as received.
The morphological structure, electrical conductivity and thermal stability of the nanocomposites were characterized by TEM, SEM, FTIR and TGA.
The SWNTs used in this work were purchased from Chengdu Institute of Organic Chemistry, Chinese Academy of Sciences. pyrrole monomer (Py), FeCl3·6H2O were used as received.
Online since: June 2014
Authors: Atchana Wongchaisuwat, Kemawadee Udomphan, Ladda Meesuk
CdS -bentonite Sulfide ion Sensor: pH Effect and Selectivity
Kemawadee Udomphan a , Atchana Wongchaisuwat b and Ladda Meesukc*
Department of Chemistry, Faculty of Science, Kasetsart University, Chatuchak, Bangkok 10900, Thailand.
Substitutions of Al3+ within the lattice structure of Si4+ in tetrahedral sheet and Mg2+ for Al3+ in octahedral sheet resulted unbalanced charge in the structural units of bentonite.
[9] G.D.Christian, Potentiometric electrodes and potentiometry, Chapter 13th in Analytical Chemistry, 6th Edition, John-Wiley&Sons, Inc., New York, 2004, pp 369-407.
Substitutions of Al3+ within the lattice structure of Si4+ in tetrahedral sheet and Mg2+ for Al3+ in octahedral sheet resulted unbalanced charge in the structural units of bentonite.
[9] G.D.Christian, Potentiometric electrodes and potentiometry, Chapter 13th in Analytical Chemistry, 6th Edition, John-Wiley&Sons, Inc., New York, 2004, pp 369-407.
Online since: November 2016
Authors: Emmanuel Iheanyichukwu Iwuoha, Priscilla Gloria Lorraine Baker, Usisipho Feleni, Nomaphelo Ntshongontshi, Rachel Fanelwa Ajayi, Samantha F. Douman, Unathi Sidwaba, Lindsay Wilson, Ezo Nxusani, Candice Rassie, Abd Almonam A. Baleg, Sinazo Qakala
The study of metals coordinated onto dendrimer structures dates back to the year 1992.
Fig. 2 (D) shows the smooth film structure of (Cu(G2PPI)-co-PPy).
Fig. 11: Structure of delavirdine.
Enzyme ultramicroelectrodes for the measurement of hydrogen peroxide at surfaces, Analytical Chemistry. 65 (1995) 3605-3614
Stenzel, Synthesis of star polymers using RAFT polymerization:What is possible, Australian Journal of Chemistry. 2006, 59, 719–727
Fig. 2 (D) shows the smooth film structure of (Cu(G2PPI)-co-PPy).
Fig. 11: Structure of delavirdine.
Enzyme ultramicroelectrodes for the measurement of hydrogen peroxide at surfaces, Analytical Chemistry. 65 (1995) 3605-3614
Stenzel, Synthesis of star polymers using RAFT polymerization:What is possible, Australian Journal of Chemistry. 2006, 59, 719–727
Online since: June 2014
Authors: Ping Yang, Lai Jun Lu
The establishment of spectrum function involves comprehensive analysis problems of interdisciplinary mass geological data, for example, the earth science data, physics data, chemistry data, remote sensing data, and so on [2,3].
This article studies this issue, and puts forward an encoding method of geological spatial objects based on α tree structure.
In Figure1, In order to make a level of "project - category - reaction" expansion and extension, we use a multi-level, multi node of tree structure, so we call it “α tree structure” that is, The depth of the tree is α.
The encoding method based on α tree structure is applied to the gold mineral unit and element variable, Statistical models are built by using the quantification theory IV.
The scale chart of 21 mineral unit Conclusions 1 Encoding the multi hierarchy geological qualitative variables with α tree structure, it is a good quantitative method. 2 α tree structure and the quantification theory IV combined to predict mineral resources, have a higher success rate.
This article studies this issue, and puts forward an encoding method of geological spatial objects based on α tree structure.
In Figure1, In order to make a level of "project - category - reaction" expansion and extension, we use a multi-level, multi node of tree structure, so we call it “α tree structure” that is, The depth of the tree is α.
The encoding method based on α tree structure is applied to the gold mineral unit and element variable, Statistical models are built by using the quantification theory IV.
The scale chart of 21 mineral unit Conclusions 1 Encoding the multi hierarchy geological qualitative variables with α tree structure, it is a good quantitative method. 2 α tree structure and the quantification theory IV combined to predict mineral resources, have a higher success rate.
Online since: February 2011
Authors: Jun Liu, Jing Wang, Ya Ting Zhang, Wen Ping Geng, Xiu Jian Chou
Influence of Film Thickness on Dielectric Properties of (Pb0.97La0.02)(Zr0.95Ti0.05)O3 Antiferroelectric Thin Films
Jun Liu, Jing Wang a, Yating Zhang, Wenping Geng and Xiujian Chou b
Key Laboratory of Instrumentation Science & Dynamic Measurement, Ministry of Education, North University of China , Taiyuan, ShanXi, 030051, China
awangjing20082007@163.com, bchouxiujian@nuc.edu.cn
Keywords: Antiferroelectirc Thin Film; Sol-Gel Chemistry; Film Thickness; Dielectric Property;
Abstract.
The phase structure of the PLZT antiferroelectric thin films was studied by X-ray diffraction (XRD) analyses.
It can be obviously obtained that all the films in this work exhibited a pure perovskite structure with the strongest peaks of (111), (100), (200).
The study of phase structure demonstrated that the PLZT films exhibit a (100) and (111) preferred orientation.
The phase structure of the PLZT antiferroelectric thin films was studied by X-ray diffraction (XRD) analyses.
It can be obviously obtained that all the films in this work exhibited a pure perovskite structure with the strongest peaks of (111), (100), (200).
The study of phase structure demonstrated that the PLZT films exhibit a (100) and (111) preferred orientation.